Generally speaking, it takes a long time to write a doctoral thesis, usually ranging from one year or more. In the process of writing, doctoral students need to consult a large number of documents, conduct experimental research and analysis, and revise and improve their papers repeatedly.
Specifically, the writing time of doctoral thesis may vary from person to person. Some doctoral students may take a long time to finish their thesis, while others may take a short time. It depends on their research field, research experience, writing ability and other factors.
In a word, the writing of doctoral thesis needs a long time and energy, and doctoral students need to be fully prepared and planned.